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Thread: No Combined Chlorine reading

  1. Back To Top    #1

    Join Date
    Jul 2013
    Harrisburg, NC

    No Combined Chlorine reading

    Need a little help. Working on getting rid of using chlorine tabs. My CYA is at 80 PPM and I don't want to go any higher. Trying to implement straight bleach. I am reading my Taylor test kit for free chlorine and I am a bit unsure of what I am reading. I think I am reading .32 PPM as I put in 2 dippers of the 0870, dropped 16 drops of 0871 into the 25ml tube to get it clear. I am suppose to multiply the .02 by the number of drops (16) which would give me .32 PPM. Sounds low to me. But I can't imagine dropping more than 16 drops in there to get this up to 3-5 PPM. So I am unsure of how I am reading this. That is issue #1. Issue #2 is when I check for combined chlorine, the test water does not change color after adding 5 drops of R-0003. The question important is a "no reading" of combined chlorine. Do I need to raise the combined chlorine. And how do I do that. temperatures are in the mid 90's this week and i want to make sure I keep it sanitized well. Can anyone help.

    11K gallon pool. Fiberglass.
    TA 80 PPM
    CYA - 80
    CH - 200

  2. Back To Top    #2
    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    SW Indiana

    Re: No Combined Chlorine reading

    You multiply by 0.2, not 0.02, so your FC is 3.2ppm.

    Combined Chlorine is undesirable, so having 0ppm is a good thing.
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  3. Back To Top    #3
    Mod Squad
    Join Date
    Aug 2012
    DFW, TX

    Re: No Combined Chlorine reading

    3.2 is low. It is important to keep chlorine above the minimum level for your CYA level at ALL times to keep your pool sanitized and algae free. You should be keeping around 9-10 at all times. Pool School - Chlorine / CYA Chart
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